Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A device on a terminal side in a wireless communication system, comprising: circuitry configured to perform first wireless communication with a LTE cell of a licensed band; search for a target cell that operates at a frequency range in an unauthorized frequency band for the terminal side, the target cell being a cell which is accessed in an unauthorized frequency spectrum; perform a second wireless communication with the LTE cell of the licensed band; detect whether an interference signal is present on a reference signal received by the device in the frequency range for a time duration exceeding a predetermined time threshold; and in response to detecting a presence of interference, notify a base station of the target cell of a result of the detection of interference, wherein, the first wireless communication and the second wireless communication perform are performed using carrier aggregation.
This invention relates to wireless communication systems, specifically addressing interference detection in devices operating in both licensed and unauthorized frequency bands. The device, located on the terminal side, includes circuitry to perform wireless communication with an LTE cell in a licensed band while also searching for and communicating with a target cell in an unauthorized frequency band. The device uses carrier aggregation to manage simultaneous communication in both bands. During operation, the device monitors a reference signal in the unauthorized frequency range to detect interference signals. If interference is detected for a duration exceeding a predetermined threshold, the device notifies the target cell's base station of the interference. This system ensures reliable communication by identifying and reporting interference in shared or unauthorized spectrums, improving network performance and user experience. The solution is particularly useful in scenarios where licensed and unlicensed bands are used together, such as in carrier aggregation setups, to maintain stable connectivity.
2. The device on the terminal side according to claim 1 , wherein, communications with the target cell are based on a synchronization signal sequence corresponding to a target frequency range to be searched.
3. The device on the terminal side according to claim 2 , wherein, downlink synchronization signals include primary synchronization signals (PSS) and secondary synchronization signals (SSS), and different physical layer cell identities (PCI's) are defined by combinations of the primary synchronization signals and the secondary synchronization signals.
4. The device on the terminal side according to claim 3 , wherein the circuitry is further configured to receive a secondary synchronization signal sequence for a secondary synchronization signal of the target cell based on a physical layer cell identity group.
5. The device on the terminal side according to claim 1 , wherein the interference signal is detected by a signal of reference signal received quality (RSRQ).
A wireless communication device on the terminal side is configured to detect and mitigate interference signals in a cellular network. The device monitors the quality of reference signals, specifically using Reference Signal Received Quality (RSRQ), to identify interference. RSRQ is a metric that combines reference signal received power (RSRP) and signal-to-interference-plus-noise ratio (SINR) to assess the overall signal quality. By analyzing RSRQ, the device can determine the presence and severity of interference affecting communication performance. The device may then apply interference mitigation techniques, such as adjusting transmission parameters, switching to a different frequency band, or requesting network assistance to reduce interference. This approach ensures reliable communication by dynamically adapting to changing interference conditions in the network. The system is particularly useful in dense urban environments or areas with high signal congestion, where interference is a common issue. The device may also include additional features, such as filtering or signal processing, to further enhance interference detection and mitigation. The overall goal is to maintain stable and high-quality wireless connections despite varying interference levels.
6. A method of operating a device on a terminal side in a wireless communication system, comprising: performing first wireless communication with a LTE cell of a licensed band; searching for a target cell that operates at a frequency range in an unauthorized frequency band for the terminal side, the target cell being a cell which is accessed in an unauthorized frequency spectrum; performing second wireless communication with the LTE cell of the licensed band; detecting whether an interference signal is present on a reference signal received by the device in the frequency range for a time duration exceeding a predetermined time threshold; and in response to detecting a presence of interference, notifying a base station of the target cell of a result of the detection of interference, wherein, the first wireless communication and the second wireless communication perform are performed using carrier aggregation.
7. The method according to claim 6 , wherein, communications with the target cell are based on a synchronization signal sequence corresponding to a target frequency range to be searched.
8. The method according to claim 7 , wherein, downlink synchronization signals include primary synchronization signals (PSS) and secondary synchronization signals (SSS), and different physical layer cell identities (PCIs) are defined by combinations of the primary synchronization signals and the secondary synchronization signals.
9. The method according to claim 8 , further comprising receiving a secondary synchronization signal sequence for a secondary synchronization signal of the target cell based on a physical layer cell identity group.
10. The method according to claim 6 , wherein, the interference signal is detected by a signal of reference signal received quality (RSRQ).
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January 26, 2021
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